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Potential Risk of Commercial Geranium to Infection by Puccinia pelargonii-zonalis

J. W. Buck

October 2007


Outbreaks of rust caused by the fungus Puccinia pelargonii-zonalis on geraniums can result in large losses due to the plants’ reduced aesthetic value and eradication efforts. To assess the potential risk of a rust outbreak in geranium production facilities, 77 commercial varieties of geranium were inoculated with a mixture of two isolates of P. pelargonii-zonalis. These data indicate that the potential for geranium rust to spread throughout commercial greenhouses is very high if an accidental introduction should occur.


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